Template:Kovanda, 1977
- Kovanda, M. 1977. Polyploidy and Variation in the Campanula rotundifolia Complex. Part II. (Taxonomic) 2. Revision of the Groups Vulgares and Scheuchzerianae in Czechoslovakia and Adjacent Regions. Folia Geobotanica & Phytotaxonomica 12(1): 23–89. JSTOR